Program does not contain a static Main method suitable for an entry point

Question

Suddenly my whole project stopped compiling at all  showing the following message      Program  path to obj project folder  does not contain a static  Main    method suitable for an entry point   I made no changes to project properties  just added some classes  moved some other classes into folders  Its an WPF Application project so it should be all OK  Entry point is where it should be  file App xaml was not modified at all     What should I do to make it work again

User · Answer

As what  I guess pixparker wanted to say  but remained to be not clear enough  for me at least  do ensure that    All  Other Projects  have an  Output Type  of  Class Library  selected while    Only  One Project  being selected as either  Window Application  or  Console Application  output

User · Answer

Maybe the  Output type  in properties- Application of the project must be a  Class Library  instead of console or windows application

User · Answer

In my case  after renaming application namespace manually  I had to reselect the Startup object in Project properties

User · Answer

Just in case someone is still getting the same error  even with all the help above  I had this problem  I tried all the solutions given here  and I just found out that my problem was actually another error from my error list  which was about a missing image set to be my splash screen  i just changed its path to the right one and then all started to work

User · Answer

Just in case anyone is having the same problem    I was getting this error  and it turned out to be my  lt Application Resources gt  in my App xaml file   I had a resource outside my resource dictionary tags  and that caused this error

User · Answer

You can also run into this if you re working on a WPF project that was started in VS 2010  Beta 1   then moved into VS 2008   Under the project properties  the  NET framework version gets unset  since  NET 4 0 isn t valid in VS 2008   and for some reason that causes this error   If you set the  NET framework  e g  to  NET 3 5   the error goes away

User · Answer

Project Properties   Output file -  Select Class Library

User · Answer

Check the properties of App xaml  Is the Build Action still ApplicationDefinition

User · Answer

I have got the same error but then I found out that I typed small m instead of capital M in Main method

[c#] Program does not contain a static 'Main' method suitable for an entry point

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